红帽全球峰会E.3. 为浮动 IP 使用原生 VLAN
Neutron 期望浮动 IP 通过标记的 VLAN（tagged VLAN）实现。如果浮动 IP 网络使用原生的 VLAN，Neutron 需要浮动 IP 直接在
br-ex 网桥上。根据是使用计划还是使用自定义的 Heat 模板集合来创建 Overcloud，参数和相关的项会有所不同。
对于基于计划的 Overcloud：
parameters:
# Set to "br-ex" when using floating IPs on the native VLAN
Controller-1::NeutronExternalNetworkBridge: "''"
对于基于模板的 Overcloud：
parameter_defaults:
# Set to "br-ex" when using floating IPs on the native VLAN
NeutronExternalNetworkBridge: "''"
下一节包括了放置到原生 VLAN 的 External 网络中的 NIC 配置的改变。除了可以用于 Horizon 仪表板和 Public API，External 网络还可以被用于浮动 IP。
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